The likes of Trafigura won't need to worry too much, people obviously won't be interested in their wrong doing even when it can be reported.
1 - "How UK oil company Trafigura tried to cover up African pollution disaster," by David Leigh. Published in The Guardian, 16th of September, 2009. (http://www.guardian.co.uk/world/2009/sep/16/trafigura-african-pollution-disaster)
2 - "Ryan Giggs named by MP over injunction," by Patrick Wintour and Dan Sabbagh. Published in The guardian, 23rd of May, 2011. (http://www.guardian.co.uk/media/2011/may/23/ryan-giggs-mp-injunction)